You can use PHP function (get_meta_tags) to get the Meta tags into an array and then extract and save them into any databse you are familiar and/or using. The following is the copy of the explanation in the PHP manual on how to use the function. Good luck

(pay attention to line endings - PHP uses a native function to parse the input, so a Mac file won't work on Unix).

The value of the name property becomes the key, the value of the content property becomes the value of the returned array, so you can easily use standard array functions to traverse it or access single values. Special characters in the value of the name property are substituted with '_', the rest is converted to lower case. If two meta tags have the same name, only the last one is returned.